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Austrian scientists marked the beginning of quantum Internet era

21 November 2017

Austrian scientists announced they managed to create an operating prototype of a router for quantum information transfer and entangled photons reception, Science Alert reports.

According to the resource, the length of time the entanglement is sustained is a key in quantum information transfer. To date, quantum communication is possible only with the use of direct fiber-optic communication, but its possibilities are limited. Devices able to receive and transfer entangled photons are needed to create a full-fledged quantum Internet.

The team of researchers led by Ralph Riedinger coped with this task. They built a device consisting of two silicon resonators, which are connected by electron beam lithography, a system of beams vibrating at a frequency of 5.1 GHz. Scientists fabricated around 500 such chips and tested each. As a result, 5 pairs of perfectly compatible chips were found. The team then cooled chips down, connected each other by optical cable fiber, and finally got the desired result.

The length of the test cables was only 20 cm, but the researchers are sure that there are no obstacles for increasing the distance up to kilometers.

"The system presented here is directly scalable to more devices and could be integrated into a real quantum network," Ridinger said.

In addition, chips can be modified to work with ultra-high-frequency quantum computers.

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